family visitor visa help...

hi all plz help me for this situation ..
i want to apply for my mother in law visit visa from pakistan actually reason why she come to the uk is i have a disable child and can not go pakistan bcz his condition so his grand mother visit to see him want to spend some time whith him but problem is she is a house wife she is not prove funds but her sister sponsor a visit actually im doing full time job but im on housing benifit support to could you plz help me for this matter how can i apply or what document we submit to support her visit
many thanks

plz help me for this matter

Does she have any funds?

No she have no funds her sister give her bank statement and affidevit and write home office she support her visit cost is this acceptable or not plz help

It may be if the support is substantial.

Hi ,
My sister who is working in India in IT sector is coming to visit me for 2 weeks.
She had applies to visit uk 3 times. First time was successful and she returned back within 1 month to continue to her work .
Second and third time when she applied UKBA had refused the visa as second time she did not show proof that employer had granted leave of absence,third time she had just joined a new job and before joining wanted to visit me , so could not show any employer laeve of absence. So they had mentioned in the refusal letter that they think she mite come here and find a job. All this was in 2012.
Now she is again applying ..she has worked for this employer for a year ..has the proof to show that leave has been granted and she will return in 2 weeks.
But since she had 2 rejections we are little worried if it will affect her current application also ?
Can someone advise on this ?

Thanks.